GST Calculator — Free Online Tool

Add or remove GST at 5%, 12%, 18% or 28% rates.

Use our GST Calculator on AllConvertor — no registration, no download, works on iPhone, Android, Windows, and Mac. All processing runs in your browser when possible for maximum privacy and speed.

Key benefits

• ✓ 100% free — no paywall or trial limits
• ✓ No account or email required
• ✓ Mobile-friendly responsive design
• ✓ Instant results in your browser
• ✓ Secure — data stays on your device
• ✓ Trusted by thousands of users daily